In. young
polyolefin films and methods
for making same

ABSTRACT

A HEAT SEALABLE FILM FOR USE IN PACKAGING COMPRISING A POLYOLEFIN FILM SUBSTRATE AT LEAST ONE SURFACE OF WHICH IS COATED WITH A LAYER OF A HEAT SEALABLE MATERIAL, WHEREIN THE FILM SUBSTRATE IS FORMED FROM A COMPOSITION COMPRISING A BLEND OF FROM 87.5 TO 60 PARTS BY WEIGHT OF POLYPROPYLENE AND FROM 12.5 TO 40 PARTS BY WEIGHT OF A BLOCK COPOLYMER OF ETHYLENE AND PROPYLENE, THE COPOLYMER CONTAINING FROM 0.5 TO 40% BY WEIGHT OF ETHYLENE, BASED ON THE WEIGHT OF THE COPOLYMER, AND THE BLEND CONTAINING FROM 0.2 TO 5% BY WEIGHT OF ETHYLENE, BASED ON THE WEIGHT OF THE BLEND.

DEFENSIVE PUBLICATION UNITED STATES PATENT AND TRADEMARK OFFICE Published at the request ot the applicant or-owner in accordance with the Notice 0! Dec. 16, 1969. 869 (LG, 687. The abstracts of Defensive Publication applications are identified by distinctly numbered series and are arranged chronologically. The heading of each abstract indicates the number 0! pages 0! specification. including claims and sheets ot drawings contained in the application as originally tiled. The tiles 0! these applications are available to the public tor inspection and reproduction may be purchased for 30 cents a sheet.

Detensive Publication applications have not been examined as to the merits of alleged invention. The Patent and Trademark Odice makes no assertion as to the novelty ot the disclosed subject matter.

PUBLISHED DECEMBER 2, 1975 T94l,020 POLYOLEFIN FILMS AND METHODS FOR MAKING SAME Roger Neville Young, Chesham, England. assignor to Imperial Chemical Industry Limited, London, England Filed Nov. 13, 1974, Ser- No. 523,530 Claims priority, application Great Britain, Dec. 21, 1973,

59.338/73 Int. Cl. 1332b 27/30, 27/32 US. Cl. 428-349 1 Sheet Drawing. 21 Pages Specification u wwwwar A heat sealable film for use in packaging comprising a polyol'efin film substrate at least one surface of which is coated with a layer of a heat sealable material, wherein the film substrate is formed from a composition comprising a. blend of from 87.5 to 60 parts by weight of polypropylene and from 12.5 to 40 parts by weight of a block copolymer of ethylene and propylene, the eopolymer containing from 0.5 to 40% by weight of ethylene, based on the weight of the copolymer, and the blend containing from 0.2 to 5% by weight of ethylene, based on the weight of the blend.

uvv- 1,v 1] IJ K.- N. YOUNG POLYOLEFIN FILMS AND METHO FOR MAKING SAME Original Filed Nov 13, 1974 

